<template>
  <div class="cart">
    <Header/>
    <div class="cart-info">
        <h3 class="cart-top">购物车结算 <span>共{{course_list.length}}门课程</span></h3>
        <div class="cart-title">
           <el-row>
             <el-col :span="2">&nbsp;</el-col>
             <el-col :span="10">课程</el-col>
             <el-col :span="8">有效期</el-col>
             <el-col :span="4">价格</el-col>
           </el-row>
        </div>
        <div class="cart-item" :key="key" v-for="course,key in course_list">
          <el-row>
             <el-col :span="2" class="checkbox">&nbsp;&nbsp;</el-col>
             <el-col :span="10" class="course-info">
               <img :src="course.course_img" alt="">
               <div class="course_name">
                 {{course.name}}
                 <span class="discount_name">{{course.discount_name}}</span>
               </div>
             </el-col>
             <el-col :span="8"><span>{{course.expire}}</span></el-col>
             <el-col :span="4" class="course-price">
               ¥{{course.real_price}}
               <span class="original-price">原价 ¥{{course.price}}</span>
             </el-col>
           </el-row>
        </div>

        <div class="discount">
          <div id="accordion">
            <div class="coupon-box">
              <div class="icon-box">
                <span class="select-coupon">使用优惠劵：</span>
                <a class="select-icon unselect" :class="use_coupon?'is_selected':''" @click="use_coupon=!use_coupon"><img class="sign is_show_select" src="../../static/image/12.png" alt=""></a>
                <span class="coupon-num">有{{coupon_list.length}}张可用</span>
              </div>
              <p class="sum-price-wrap">商品总金额：<span class="sum-price">{{total}}元</span></p>
            </div>
            <div id="collapseOne" v-if="use_coupon">
              <ul class="coupon-list"  v-if="coupon_list.length>0">
                <li class="coupon-item" :class="check_use(item)" @click="check_click(item)" v-for="item in coupon_list">
                  <p class="coupon-name">{{item.coupon.name}}</p>
                  <p class="coupon-condition">满{{item.coupon.condition}}元可以使用</p>
                  <p class="coupon-time start_time">开始时间：{{item.start_time.replace('T', ' ')}}</p>
                  <p class="coupon-time end_time">过期时间：{{end_time(item.start_time, item.coupon.timer)}}</p>
                </li>
              </ul>
              <div class="no-coupon" v-if="coupon_list.length<1">
                <span class="no-coupon-tips">暂无可用优惠券</span>
              </div>
            </div>
          </div>
          <div class="credit-box">
            <label class="my_el_check_box"><el-checkbox class="my_el_checkbox" v-model="use_credit"></el-checkbox></label>
            <p class="discount-num1" v-if="!use_credit">使用我的贝里</p>
            <p class="discount-num2" v-else><span>总积分：{{user_credit}}，已抵扣<el-input-number v-model="credit" :min="1" :max="max_credit()" label="请填写积分"></el-input-number>积分，剩余{{parseInt(user_credit - credit)}}积分</span></p>
          </div>
          <p class="sun-coupon-num">积分抵扣：<span>{{(credit/credit_to_money).toFixed(2)}}元</span></p>
        </div>

        <div class="calc">
            <el-row class="pay-row">
              <el-col :span="4" class="pay-col"><span class="pay-text">支付方式：</span></el-col>
              <el-col :span="8">
                <span class="alipay" @click="pay_type=1">
                  <img v-if="pay_type==1" src="../../static/image/alipay2.png" alt="">
                  <img v-else src="../../static/image/alipay.png" alt="">
                </span>
                <span class="alipay wechat" @click="pay_type=2">
                  <img v-if="pay_type==2" src="../../static/image/wechat2.png" alt="">
                  <img v-else src="../../static/image/wechat.png" alt="">
                </span>
              </el-col>
              <el-col :span="8" class="count">实付款： <span>¥{{(real_total - credit/credit_to_money).toFixed(2)}}</span></el-col>
              <el-col :span="4" class="cart-pay"><span @click="payHander">去支付</span></el-col>
            </el-row>
        </div>
    </div>
    <Footer/>
  </div>
</template>

<script>
  import Header from "./common/Header"
  import Footer from "./common/Footer"
  export default {
    name:"Order",
    data(){
      return {
          user_credit: localStorage.user_credit || sessionStorage.user_credit,   //用户积分
          credit_to_money: localStorage.credit_to_money || sessionStorage.credit_to_money,    //换算比例
          course_list:[],     // 勾选商品
          pay_type: 1,        // 支付方式
          use_credit: false,  // 是否使用了优惠券
          credit: 0,          // 积分
          use_coupon: false,  // 优惠券ID，0表示没有使用优惠券
          coupon: 0,          // 优惠券ID，0表示没有使用优惠券
          coupon_list:[],     // 优惠券列表
          total: 0,           // 购物车中商品总金额
          real_total: 0,      // 实际付款金额
      }
    },
    components:{
      Header,
      Footer,
    },
    created(){
      this.check_user_login();
      this.get_selected_course();
      this.get_user_coupon();
    },
    watch:{
        coupon(){
            // 每次用户调整优惠券的时候，实付价格发生变动
            this.total = this.get_total();
            this.real_total = this.get_total(true);
        },
        use_coupon(){
            if(!this.use_coupon){
                // 当用户不适用优惠券时，把用户当前优惠券重置为0
                this.coupon = 0;
            }
            // 每次用户调整是否使用优惠券的时候，实付价格发生变动
            this.total = this.get_total();
            this.real_total = this.get_total(true);
        },
        use_credit(){
            if(!this.use_credit){
                // 当用户不适用积分抵扣时，把用户当前设置的积分抵扣进行重置
                this.credit = 0;
            }
            // 每次用户使用积分抵扣时，总价格都要重新计算
            this.total = this.get_total();
            this.real_total = this.get_total(true);
        }
    },
    methods: {
      check_user_login(){
        // 检查用户是否登录了
        let user_token = localStorage.user_token || sessionStorage.user_token;
        if( !user_token ){
            // 判断用户是否登录了
            this.$confirm("对不起，您尚未登录！请登录后继续操作！","警告").then(()=>{
                this.$router.push("/user/login");
            });
        }
        return user_token;
      },
      max_credit(){
          // 计算积分可使用的最大积分数量（总积分，商品总价）
          let user_credit = parseInt(this.user_credit);
          let credit_to_money = parseInt(this.credit_to_money);
          if(user_credit / credit_to_money > this.total){
              return this.total * credit_to_money
          }else{
              return user_credit
          }
      },
      check_use(user_coupon){
          // 检查优惠券是否过期
          let start = new Date(user_coupon.start_time) - 0;
          let now = new Date() - 0;
          let end = start + user_coupon.coupon.timer * 24 * 60 * 60 * 1000;
          if (start > now){
              this.disable = true;
              // 生效期还没有到
              return 'disable'
          }
          if(now > end){
              // 优惠券已经过期
              this.disable = true;
              return 'disable'
          }
          if(this.coupon == user_coupon.id){
              // 选中状态
              return 'active'
          }
          return ''
      },
      check_click(user_coupon){
          // 保存优惠券ID
          let start = new Date(user_coupon.start_time) - 0;
          let now = new Date() - 0;
          let end = start + user_coupon.coupon.timer * 24 * 60 * 60 * 1000;
          if(now > start && now < end){
              this.coupon = user_coupon.id;
          }
      },
      end_time(start_time, timer){
          // 计算优惠券过期时间
          // 开始时间
          let start = (new Date(start_time) - 0) / 1000;   //时间戳,单位秒
          // 结束时间
          let end = (start + timer * 24 * 60 * 60) * 1000;
          let end_date = new Date(end);
          let Y = end_date.getFullYear() + '-';
          let M = (end_date.getMonth() + 1) + '-';
          let D =  end_date.getDate() + ' ';
          let h = end_date.getHours() + ':';
          let i =  end_date.getMinutes() + ':';
          let s = end_date.getSeconds();
          M = M>9 ? M : '0'+M;
          D = D>9 ? D : '0'+D;
          // h = h>9 ? h : '0'+h;
          // i = i>9 ? i : '0'+i;
          // s = s>9 ? s : '0'+s;
          return Y+M+D+h+i+s
      },
      get_user_coupon(){
          // 获取当前登录用户的优惠券
          let user_id = localStorage.user_id || sessionStorage.user_id;
          this.$axios.get(`${this.$settings.Host}/coupon/`, {
              params: {
                  user_id: user_id,
              },
              headers: {
                  "Authorization":"jwt " + this.check_user_login(),
              }
          }).then(response=>{
              this.coupon_list = response.data;
              this.total = this.get_total();
              this.real_total = this.get_total(true);
          }).catch(error=>{
              console.log(error.response)
          })
      },
      get_selected_course(){
        // 获取购物车中的勾选商品
        this.$axios.get(`${this.$settings.Host}/cart/course/selected/`,{
          headers:{
            "Authorization":"jwt " + this.check_user_login(),
          }
        }).then(response=>{
          this.course_list = response.data;
          this.total = this.get_total();
          this.real_total = this.get_total(true);
        }).catch(error=>{
          console.log(error.response);
        });
      },
      get_total(user_coupon){
          // 是否使用优惠券，并计算对应总价
          let total = 0;

          for(let key in this.course_list){
              total += parseFloat(this.course_list[key].real_price);
          }

          // 添加优惠券后的总价格
          if(user_coupon && this.coupon>0){
              for(let item in this.coupon_list){
                  let coupon_item = this.coupon_list[item];
                  if(coupon_item.id == this.coupon){
                      // 判断当前购买金额是否满足优惠券的条件
                      if(coupon_item.coupon.condition <= total){
                          // 截取优惠券后面的数值
                          let sale_num = parseFloat(coupon_item.coupon.sale.slice(1));
                          if(coupon_item.coupon.sale[0] == '-'){
                              // 满减优惠券
                              total -= sale_num;
                          }else if(coupon_item.coupon.sale[0] == '*'){
                              // 折扣优惠券
                              total *= sale_num;
                          }
                      }

                  }
              }
          }

          return total.toFixed(2);
      },
      payHander(){
          // 生成订单
          this.$axios.post(`${this.$settings.Host}/order/`,{
              pay_type: this.pay_type,
              credit: this.credit,
              coupon: this.coupon
          },{
              headers:{
                "Authorization":"jwt " + this.check_user_login(),
              }
          }).then(response=>{
              // 下单成功,并发起支付
              this.get_alipay_payment_url(response.data.order_number);
          }).catch(error=>{
              console.log(error.response);
          })
      },
      get_alipay_payment_url(order_number){
          this.$axios.post(`${this.$settings.Host}/payments/${order_number}/alipay/`).then(response=>{
              // 页面跳转
              location.href = response.data.pay_url;
          }).catch(error=>{
              console.log(error.response)
          })
      },
    }
  }
</script>

<style scoped>
.cart{
  margin-top: 80px;
}
.cart-info{
  overflow: hidden;
  width: 1200px;
  margin: auto;
}
.cart-top{
  font-size: 18px;
  color: #666;
  margin: 25px 0;
  font-weight: normal;
}
.cart-top span{
    font-size: 12px;
    color: #d0d0d0;
    display: inline-block;
}
.cart-title{
    background: #F7F7F7;
    height: 70px;
}
.calc{
  margin-top: 25px;
  margin-bottom: 40px;
}

.calc .count{
  text-align: right;
  margin-right: 10px;
  vertical-align: middle;
}
.calc .count span{
    font-size: 36px;
    color: #333;
}
.calc .cart-pay{
    margin-top: 5px;
    width: 110px;
    height: 38px;
    outline: none;
    border: none;
    color: #fff;
    line-height: 38px;
    background: #ffc210;
    border-radius: 4px;
    font-size: 16px;
    text-align: center;
    cursor: pointer;
}
.cart-item{
  height: 120px;
  line-height: 120px;
  margin-bottom: 30px;
}
.course-info img{
    width: 175px;
    height: 115px;
    margin-right: 35px;
    vertical-align: middle;
}
.alipay{
  display: inline-block;
  height: 48px;
}
.alipay img{
  height: 100%;
  width:auto;
}

.pay-text{
  display: block;
  text-align: right;
  height: 100%;
  line-height: 100%;
  vertical-align: middle;
  margin-top: 20px;
}
.course-price{
    line-height: 28px;
    padding-top: 30px;
}
.course-price .original-price{
    display: block;
    text-decoration: line-through;
    color: #9b9b9b;
}
.course-info img{
    float: left;
}
.course-info .course_name{
    float: left;
    line-height: 28px;
    padding-top: 30px;
}
.course-info .course_name .discount_name{
  display: block;
  height: 14px;
  color: #ffc210;
}

.coupon-box{
  text-align: left;
  padding-bottom: 22px;
  padding-left:30px;
  border-bottom: 1px solid #e8e8e8;
}
.coupon-box::after{
  content: "";
  display: block;
  clear: both;
}
.icon-box{
  float: left;
}
.icon-box .select-coupon{
  float: left;
  color: #666;
  font-size: 16px;
}
.icon-box::after{
  content:"";
  clear:both;
  display: block;
}
.select-icon{
  width: 20px;
  height: 20px;
  float: left;
}
.select-icon img{
  max-height:100%;
  max-width: 100%;
  margin-top: 2px;
  transform: rotate(-90deg);
  transition: transform .5s;
}
.is_show_select{
  transform: rotate(0deg)!important;
}
.coupon-num{
    height: 22px;
    line-height: 22px;
    padding: 0 5px;
    text-align: center;
    font-size: 12px;
    float: left;
    color: #fff;
    letter-spacing: .27px;
    background: #fa6240;
    border-radius: 2px;
    margin-left: 20px;
}
.sum-price-wrap{
    float: right;
    font-size: 16px;
    color: #4a4a4a;
    margin-right: 45px;
}
.sum-price-wrap .sum-price{
  font-size: 18px;
  color: #fa6240;
}

.no-coupon{
  text-align: center;
  width: 100%;
  padding: 50px 0px;
  align-items: center;
  justify-content: center; /* 文本两端对其 */
  border-bottom: 1px solid rgb(232, 232, 232);
}
.no-coupon-tips{
  font-size: 16px;
  color: #9b9b9b;
}
.credit-box{
  height: 30px;
  margin-top: 40px;
  display: flex;
  align-items: center;
  justify-content: flex-end
}
.my_el_check_box{
  position: relative;
}
.my_el_checkbox{
  margin-right: 10px;
  width: 16px;
  height: 16px;
}
.discount-num1{
  color: #9b9b9b;
  font-size: 16px;
  margin-right: 45px;
}
.discount-num2{
  margin-right: 45px;
  font-size: 16px;
  color: #4a4a4a;
}
.sun-coupon-num{
  margin-right: 45px;
  margin-bottom:43px;
  margin-top: 40px;
  font-size: 16px;
  width: 100%;
  text-align: right;
  color: #4a4a4a;
  display: inline-block;
}
.sun-coupon-num span{
  font-size: 18px;
  color: #fa6240;
  margin-right: 40px;
}
.coupon-list{
  margin: 20px 0;
}
.coupon-list::after{
  display: block;
  content:"";
  clear: both;
}
.coupon-item{
  float: left;
  margin: 15px 8px;
  width: 180px;
  height: 100px;
  padding: 5px;
  background-color: #fa3030;
  cursor: pointer;
}
.coupon-list .active{
  background-color: #fa9000;
}
.coupon-list .disable{
  cursor: not-allowed;
  background-color: #fa6060;
}
.coupon-condition{
  font-size: 12px;
  text-align: center;
  color: #fff;
}
.coupon-name{
  color: #fff;
  font-size: 24px;
  text-align: center;
}
.coupon-time{
  text-align: left;
  color: #fff;
  font-size: 12px;
}
.unselect{
  margin-left: 0px;
  transform: rotate(-90deg);
}
.is_selected{
  transform: rotate(-1turn)!important;
}
</style>
